Fate/Grand Order Absolute Demonic Front: Babylonia

Season 1, Episode 20

Episode Title: Absolute Demonic Front Mesopotamia II

Air Date: 2020-03-14

Overview:

Tiamat falls into the underworld, but there, she transforms into one of the Evils of Humanity: Beast II. Hassan-i Sabbah, the first Old Man of the Mountain, intervenes, using his power as Grand Assassin to deprive Beast II of her immortality.